internally balanced 360 crank (BIG PROBLEM) need input

memike said

I have been looking at some videos on balancing a crank shaft and can anyone tell me the advantage of internal balancing a crank ?
I agree when the plug came out of the crank that was put in the wrong way that the crank and block took a beating... whose Idea was it to change to an eternal balanced crank
anyway..
How to Balance internally & externally balanced Crankshafts (Crank) - YouTube

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360s are all external balance because the factory cast iron cranks don't have enough meat to internally balance the piston and rod combo.
The main advantage is it places the counterbalancing weight inside the main caps. That reduces stress and flexing and torsional harmonics in any crank. That adds up to more ability to handle more power, more power out the back, smoothness, better fuel economy, and better life span. Additionally it allows you to use any neutral harmonic dampener and any neutral flex plate and convertor/flywheel.
I internally balance everything I do for those reasons.